G-code Severity Modifiers for PROMIS®

Patient scores on select PROMIS® measures can be mapped directly to G-code severity modifiers required by the Centers for Medicare and Medicaid.


G Code Severity Modifier Diagram High ScoresBetter Function PROMIS Mar2019


G Code Severity Modifier Diagram High ScoresWorse Function PROMIS Mar2019



Severity Modifier Tables

Assigning a G-code severity modifier (level of impairment) to a patient relies on clinical judgment. The tables below can inform decision-making by providing detailed information about PROMIS score ranges associated with individual G-code severity modifiers.

Note: A higher PROMIS T-score represents more of the concept being measured. For negatively-worded concepts like fatigue or pain interference, a T-score of 60 is one standard deviation worse than average. By comparison, a fatigue T-score of 40 is one standard deviation better than average. The reverse is true for positively worded concepts like physical function (i.e., higher scores indicate better function).

Additional information about the methods used for creating G-code severity modifiers is available.  Learn more >>


Severity Modifiers for PROMIS Physical Function Scores

Severity modifiers PROMIS PF

Severity Modifiers for PROMIS Pain Interference and Fatigue Scores

Severity modifiers PROMIS Fatigue Pain Int